(19521) Chaos


This object has a more recent orbit available here

Object

Object (19521) Chaos
Diameter(1) 600 km
Dynamic class(1) cubewano
Absolute magnitude 4.80
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458600.5
Semi major axis 45.462640 ± 0.006558 au
Eccentricity 0.098650541 ± 0.000082401
Inclination 12.057007344 ± 0.001205719 °
Longitude of ascending node 50.042631 ± 0.001325 °
Argument of perihelia 58.484608 ± 0.038802 °
Mean anomaly 340.753969 ± 0.036136 °
Orbital period 306.54 yr

Ephemeris & Observations

Ephemeris version NIMAv2
Observation file (documentation) omc_ast_NIMAv2.txt
bsp file 19521_Chaos_nima_v2.bsp
Date of first observation 1991-10-17
Date of last observation 2018-12-06
Number of observations used in the fit 162
Number of rejected observations 0
Number of DES observations 0
Number of MPC observations 112
Number of unpublished observations 50
RMS of observations 0.414 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2018-01 0.116 0.103
2018-07 0.198 0.103
2019-01 0.158 0.112
2019-07 0.256 0.109
2020-01 0.218 0.123
2020-07 0.324 0.116
2021-01 0.292 0.134
2021-07 0.403 0.124
2022-01 0.380 0.146

Ephemeris comparison

residual plot

Difference between NIMAv2 and JPL12 in right ascension (weighted by cos δ) and in declination.
Gray area represents the 1-σ uncertainty of NIMA ephemeris. Green dots represent the DES observations.